Crater Lake is 5 miles wide and ringed by cliffs almost 2,000 feet high, the lake rests in the shattered remnants of a volcano called Mount Mazama, which erupted and collapsed into itself 7,700 years ago. Later eruptions formed Wizard Island and other volcanic features, now hidden under the lake. Crater Lake filled with rain and melted snow. At 1,943 feet deep, it is the deepest lake in the US and one of the deepest in the world. Click older posts for more pics